Type-writer machine.



H. GRUTGHLEY. TYPE WRITING MACHINE. APPLICATION FILED APR.14,1910.

Patented Nov. 15, 1910.

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HARRY CRUTC-HLEY, 0F JERSEY CITY, NEW JERSEY, ASSIGNOR T0 UNDERVJOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., COR-PDRATION OF DELAWARE.-

TYPE-WRITING MACHINE.

Specification of Letters Patent. PatentedNov. 15, 1910.

Application filed April 14, 1910. Serial No. 555,371.

the paper, and operative to indicate when.

the bottom edge of the work shcetapproaches the printing line.

The main object is the provision of improved and simplified means for releasably locking the platenitself against rotation, to enable the temporary disengagement of the locking mechanism during the insertion and removal of the work sheets, the locking mechanism being left free to operate after the insertion of a sheet. Accordingly, I provide the platen witha positively-operated trip controlled by the work sheet and connected with a dog which engages a ratchet to lock the platen against turning. The thrust of a dog releaser carries an interponent into engagement with the dog to temporarily release or disengage the dog from the ratchet, when it is desired to advance the paper one or more l1ne-spaces,'or

to insert and remove the sheets without per,

manently releasing the platen lock, the tinger being automatically returned to inactive position as soon as the operators hand is removed therefrom, to leave the platen-locking mechanism free to operate after the in sertion of a sheet. An adjustable detent opcrates the dog releaser to hold the locking mechanism in idle position, when it is not to be used.

In the accompanying drawings, Figure 1 is a perspective View of one end of the platen of an Underwood writing machine, equipped with my invention. Fig. 2 is an end View, partly in section and broken away, showing the positions of the partswhen a work sheet is in the machine. 3 is a similar view,

showingthe platen locked against rotation;

Fig. 4 is a similar view, showing the dog held disengaged from the ratchet; dotted lines indicating the inactive position ofthe detent. Fig. 5 is a plan, showing the parts in the positions shown in Fig. 2. s

The platen 1 is journaled by an axle 2 in l the ends 3 of a platen frame, and is turned .by a line-spacing lever t which operates a The sheet of paper 13 inserted into the machine, will introduce ltsel'f between" the.

rounded free" end of the .trip 19. and the platen (as shown in Fig. 2), and cover the groove 13 in the platen to hold the trip 12 out of the groove and thereby maintain the dog 5) out of engagement with its ratchet 8. As soon as the bottom edge of. the sheet passes the endof the trip, thereby uncover: ing the groove, the trip is positively forced into the groove by a sprii'igl-t which also cii'ects the engagement ofthe dog 9 with the ratchet 8 on the platen to. prevent rotation of the platen, and thereby indicate the proximity of the bottom edge of the sheet to the printing line. The dog maybe temporarilv disengaged from the ratchet, to permit 'LilG plat-en and paper to be advanced for the addition ,of another line of writing, or to enable the sheet to-be removed and another inserted, by pressing-the fingerrpiece 15 carried by one end of a dog releaser comprising a rocking arm or linger 15, conveniently pivoted at 16 on a rod 16. Said rocking arm carries an interponent or lateral projection 17 which, when the arm is depressed, engages and swings the dog 9 away from the ratchet 8 against the tension of its return spring l l, as shown in Fig. 4. It will be noticed that said finger-piece 15 overlies one end 3 of the platen frame, where it is convenient to rest the hand when inserting the sheets into or removing them from the machine, thereby avoiding'the necessity of a separate motion to release the platen. A. spring 18 returns the rocking arm to idle position the moment the latter is released, to enable the spring 14 to reengage the dog with the ratchet, so that if a new sheet has been inserted, the locking inechanism is left in position to operate. The spring-actuated throw of the'dog releasermay be arrested, by the usual tie-rod lie " serve to arrest the throw of the detent lever- 'its pivot as the interponent is brought into engagement with the dog. The detent lever 19 maintains its adjusted positions, because of a friction Washer 21 WlllCll presses said Idete'nt lever against its pivot 20. The ena 'ement of the fin eriece 15 of he do 33 b p C) releaser, with which the intepponen 17 is connected, with the platen frame end may and the dog 9. The movement of said detent to idleposition enables the springs 14: and 18 to return the dog and dog releaser to operative and idle positions, respectively. The paper deflector 23 may be apertnred, as at 24, Fig. 2,. to accommodate the free end of the trip 12 and afford access therefor to the groove 18.

Variations may scope' of the invention, and portions of the improvements may be used'without others.

Having thus described my invention, I claim: i

1. In a typewriting machine, the combinationwith a rotatable platen, of a paper-end indicator including means to lock the platen against turning, releasing means to effect the temporary disengagement of the locking -means, and a device to disconnect the locks ing means and hold it in idle position.

2. In a typewriting machine, the combination with a rotatable platen having a ratchet, a paper-controlled locking dog to engage the ratchet and lockthe platen against turning, a rocking finger having an interponent to engage and disengage. the locking dog from the ratchet, and a detent into-Whose path the interponent projects;

said deten't movable 'to operate the interponent to disengage the locking dog from the be resorted to Within the ratchet, and e'flective to hold the locking dog in idle position.

3. In a typevvriting machine, the combina tion with a platen and line-space mechanism therefor, of a paper-end indicating device including a paper-controlled tripfa platenlocking mechanism controlled by the trip, and a normally inoperative lock releasing arm having a finger-piece lying in position to be engaged when inserting paper into the machine, to temporarily disengage the platen-locking mechanism.

4. In a typev'vriting machine, the combination with a platen and line-space mechanism therefor, of a paper-end indicating device including a paper-controlled trip, a platenlockin mechanism controlled by the trip, a norma ly inoperative lock. releasing arm having a finger-piece lying in position to'be" engaged when insertin paper ,into the machine, to temporarily disengage the platenlocking mechanism, and a detent to maintain the locking mechanism in a position of disuse.

5. In a typewriti'ng machine, the combination 'With a platen, a ratchet thereon, and a paper-controlled dog tending to engage the ratchet to lock the platen, against rotation, of a pi'voted dog releaser, one end of which lies in position to be operated when inserting paper into the machine, and a spring to return the dog releaser to inoperative position.

6. In a typewritin machine, a platen locking mechanism to indicate when the bottom edge ofthe-paper approaches the printing line, comprising a ratchet clutched by ,a' dog to prevent rotation of the platen to advance the paper thereon, said dog being normally held'idle by a paper controlled trip connected thereto, and positively rocked to enter a groove in the platen uncovered by the paper, means to temporarily release the dog from operative position, and means to hold the dog in idle position.

HARRY CRUTCHLEY. Witnesses:

K. FRANKroR'r C. RIP EY; 

